Miner&#39;s squib.



Patented lune l8, i901. l. T. JENKINS.

MINERS SQUIB.

(Application filed Apr. 22, 1901.)

(No Model.)

' ummulioz J8me YT Jan/um.

UNITED STATES ATENT FFICEt ISAAC T. J lfih' KIND, Uh PLYMOUTH,PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO SAMUEL SALSBURG, OF SAME PLACE,AND ABRAM SALSBURG,

\YlLhllS lAR'RE, PENNSYLVANIA.

MENERS SQUIB.

SPECIFICATION forming part of Letters IPatent No. 676,502, dated June18, 1901.

Application filed April 22. 1901.

To It whom; ('6 may concern:

llc itknown that I, ISAACT. JENKINS, a citizen of theUnited States,residing at Plymouth, in the county of Luzerue and State ofPennsylvania, have invented certain new and useful Improvements inMiners Squibs; and I do declare the following to be a full, clear, andexact description of the invention, such will enable others skilled inthe art to which it ap 1o pertains to make and use the same.

This invention relates to miners squibs; and the object of the same isto construct the squib so as to guarantee absolute safety in the usethereof and which will show conclusively to the miner that the squib isperfectly safe and reliable, the squib being specially adapted.- fornse'in gaseous mines or mines traversed by strong wind-currents. Iacc0mplish this by providing a. shredded or slitted 2o twisted matchthat can be instantly opened, which every mineris very prone todo,whether the tube part is hermetically sealed or not, in order toexamine the interior of match to see that no stray grains of powder haveacci- 2 5 dentaliyadhered to the match.

To this end the invention consists in the details of constructionhereinafter more fully described, and particularly pointed out in theappended claims.

Figure 1 is s perspective View of a miners squib constructed inaccordance with my invention. Fig. 2 is a plan of tee blank from whichthe squib is made. Fig. 3 is it View showing the manner in which the.squib is formed. Fig. his a longitudinal section through the tube ofthe squib and shows the match opened for inspection.

Referring to the drawings, the numeral 1 designates the paper case ortube, 2 the e.

o plosive filling, and 3 the match of the squib.

5, Figs. 2 and 3, designates the paper blank: from which the squib ismade, said blank havlog a trapezoidahsliaped shredded or slitted end 6,which when rolled and twisted by hand forms the completed match 3.

In the construction of my improved squib the paper blank is laid upon aflat and smooth base of slate or marble, a cylindrical. needle or former7 laid thereon at the right or left band edge thereofpwith one end ofthe needle Serial No. 56,979. (No'znodcih end projecting to base ofslits, and the paper is then rolled on the needle ina manner known toall familiar with the art of paper tubing and assumes the shape shown inFig. l. The paper can be rolled-from either edge, so that the squib canbe formed by either right or left lmud persons. The powder is theninsorted and the open end of squib is closed with acompositionconsisting of picric acid, litharge, wood-naphtha, andshellac or gum- 6o araoic in or about the following porportions: picricacid, thirty-two parts; litharge, twenty parts; wood-naphtha, eightparts, and gum shellac or arabic, one part.

The advantages of my improved squib over those heretofore made is thefacility in opening and closing match. Heretofore the objection has beenraised that too much time was taken up in opening match and closing it,while a transparent match is utterly useless {as well as dangerous, as atransparent match necessitates the use of a lamp with a glass "lobe orbulb carried by the miner to enable him to examine the matchunderground. In my squib all unuccessarylaborin untwisting or examiningby any method not attainable underground is dispensed with, as the match.part can be instantly untwisted and opened and closed and rendered atime-fuse, according to the discretion of the miner or '80 the distancehe has to traverse to a place of safety.

In my invention the slitted strands overlapping each other practicallyform a barrier to the powder from entering the match, at the same timeforming no impediment to the fire entering powder in the tube at theplace intended, there being no obstacle in the shape of aturned-overtongue atinsertion of match within thetube.Whenaturned-overtongue is used, the fire in the match is apt to leavethe tongue, thus crawling along the outside of the body of tube,igniting the powder at about the center of squib, causing it to blowout. Particularly is this the case'where blowl 5 ers or volumes of gasare encountered in holes after tamping--a process necessary beforeadding squib for blasting.

When the powder in the tube has caught fire otherwise than at the placeor point in- 103 tended, such as base or insertion of match, the forceof such a squib is rendered inadequate to the force of gas sometimesencountered in holes while blasting. In my squib the danger. abovealluded to is not encountered.

In the construction of my improved squib the needle is extended to baseof the slits and theedge of the blank turned over needle, as shown inFig. 3, and rolled until the whole assumes the shape shown in Figs. 1and 4, when paste or other" adhesive matter is applied along theprojecting outer edge, when the needle and paper are rolled to form acomplete tube. This tube will be closed at the junction of thetube-body, which closure is edecte'd by the shreds or strands of matchparts overlapping each other under the process of rolling. The match isthen twisted by hand, when the squib presents the appearance shown inFig. 1.

The use of mysquib is well known to miners and need not be explained atlength.

2. A blank for miners squibs, composed of 30 a strip of paper or thelike having a trape;

zoidal-shaped en l shredded or slitted lonfiitudinally and adapted to betwisted to form the match. i 3. A miners squib, composed of a strip of35 paper or the like rolled to form a tube containing an explosivecharge and having a shredded or slitted end twisted to form thematch.

In testimony whereof I my hand in presence of two subscribing witnesses.

ISAAC 'l. JENKINS.

Witnesses: ELEANOR I). MUCAI-I'JNEY, ELME]: (l. l urs'r.

have hereunto set 0

